206556197 has 2 divisors, whose sum is σ = 206556198. Its totient is φ = 206556196.

The previous prime is 206556149. The next prime is 206556221. The reversal of 206556197 is 791655602.

206556197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115906756 + 90649441 = 10766^2 + 9521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206556197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206556107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103278098 + 103278099.

It is an arithmetic number, because the mean of its divisors is an integer number (103278099).

Almost surely, 2^206556197 is an apocalyptic number.

It is an amenable number.

206556197 is a deficient number, since it is larger than the sum of its proper divisors (1).

206556197 is an equidigital number, since it uses as much as digits as its factorization.

206556197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 206556197 is about 14372.0630738944. The cubic root of 206556197 is about 591.1251124883.

The spelling of 206556197 in words is "two hundred six million, five hundred fifty-six thousand, one hundred ninety-seven".